Method of sizing cellulose fibers



Patented June 22, 1926.

UNITED STATES PATENT OFFICE.

JUDSON A. DE CEW, Oil? NEW YORK, N. Y.

METHOD OF SlIZING CELLULOSE FIBERS.

No Drawing.

fore the heater is discharged.

After the stock leaves the beater, it is passed throu h a beating or grinding engine, called a Jor an, where a violent beating action is given to the mass.

The coagulated sizing material is in a very high dispersed and hydrated condition when it is freshly precipitated, but as it passes through the Jordan in the presence of excess of sulphate of alumina, the violent beating action has a stron dehydrating action on the alumina an rosin hydrates. Moreover, the sizing material that is precipitated upon the surface of the fibers will be scraped off and left as a filling material between the fibers.

The discovery of this fact explains why the sizing from the paper machine is never as efficient as that carried out by means of laboratory tests.

. Then the size'is added to the beater, as is the common practice, it may be coagulated by impurities such as salts of calcium or magnesium, which are present in the water surrounding the stock. These salts may be a part of the natural Water or may be extracted from impurities in the pulp itself. The size is always coagulated in the beater either by earth impurities or by the sulphate of alumina, used for sizing, or both,

Application filed September 19, 1925.

Serial No. 57,470.

and is materially injured by the beating action of the Jordan, and the only way to avoid this condition is to keep the size out of the stock until after it has passed through the Jordan.

This application may be carried out by addin the size and alum to the paper stock after it has passed through the Jordan treatment, or the size may be added after the 'Jordan, to the stock which has alread been treated with sulphate of alumina 1n the beater.

There are certain kinds of paper where hydration is not required and where it is desirable to treat the stock in the beater with alum in water to destroy earth carbonates before he sizing operation.

When this condition exists, the alum is added to the stock in the beater which is then passed through the Jordan and the size added in a mixing apparatus between the Jordan and the paper machine.

I claim as my invention 1. A method of sizing paper, which consists in adding the size and alum to the paper stock after the fibers of said stock have passed through the Jordan.

2. A method of sizing paper, which consistsin adding a size solution to the paper stock after said stock has been treated by the Jordan.

ture.

JUDSON A. DE OEW.

Patented June 22, 1926.

UNITED STATES PATENT OFFICE.

JUDSON a. on cnw, on NEW YORK, 11. Y.

METHOD OF SIZING CELLULOSE FIBERS.

1T0 Drawing.

Engine sizing of machine made aper by means of rosin size and sulphate alumina is carried on in the beatin engine or mixer. Sometimes the alum is ad ed before the size 6 and sometimes the size is added to the paper stock before the alum. The size however is always coagulated be fore the beater is discharged. After the stock leaves the beater, it 1s 10 passed throu h a heating or grinding engine,

called a Jor an, where a violent beating action is given to the mass. L

The coagulated sizing material is in a very high dispersed and hydrated condition when it is freshly precipitated, but as it passes through the Jordan in the presence of excess of sulphate of alumina, the violent beating action has a stron dehydrating action on the alumina an rosin hydrates. 10 Moreover, the sizing material that is precipitated upon the surface of the fibers will be scraped OH and left as a filling material between the fibers.

The discovery of this fact explains why the sizing from the paper machine is never as eificient as that carried out by means of laboratory tests.

1 \Vhen the sizeis added to the beater, as is the common practice, it may be coagulated so by impurities such as salts of calcium or magnesium, which are .prese'ntin the water surrounding the stock. These salts may be a part of the natural water or may be extracted from impurities in the pulp it- 36 self. The size is always coa lated in the beater either by earth impurities or by the sulphate of alumina, used for sizing, or both,

Application filed September 19, 1925. Serial No. 57,470.

and is materially injured by the heating action of the Jordan, and the only way to avoid this condition is to keep the size out 40 of the stock until after it has passed through the Jordan.

This application may be carried out I) adding the size and alum to the paper stoc after it has passed throu h the Jordan treatment, or the size may e added after the Jordan, to the stock which has already been treated with sulphate of alumina 1n the beater.

There are certain kinds of paper where hydration is not required and where it is desirable to treat the stock in the beater with alum in water to destroy earth carbonates before he sizing operation. When this condition exists, the alum is added to the stock in the beater which is then passed through the Jordan and the size added in a mixing apparatus between the Jordan and the paper machine.

I claim as my invention- 1. A method of sizing paper, which consists in adding the size and alum to the paper stock after the fibers of said stock have passed through the Jordan.

2. A method of sizing paper, which consists in adding a size solution to the paper stock after said stock has been treated by the Jordan.

3. A method of sizing paper, which consists in coagulating the size in the stock after said stock has passed through the Jordan.

In testimony whereof, I afiix my signature.

JUDSON A. DE CEW.

DISCLAIMER 1,589,947.Juds0n A. De (Jew; New York, N. Y.

Patent "dated June 22, 1926.

FIBERS.

Mn'rHon OF SIZING CELLULosE Disclaimer filed November 8, 1934,

by the assignee, Process Engineers, Inc.

Hereby enters this disclaimer of claims I and 2 and of that part of the thing atented WhlCh is embraced by claims 1 and 2 in said specification, which are in the ollowing words, to wit:

1...A methodof sizing paper, which consists in adding the size and alum to the paper stock after thefibersof said stock have passed through the Jordan.

2. A method of slzlng paper $1011 consists in adding a. size solution to the prim-{stock after said stock has bdlig [Qjyic'ial Gazette December" 4, 1.9341

gated by the Jordan.

DISCLAIMER 1,589,947.Juds0n A. De Ce'w; New York, N. Y. M HTHOD OF SIZING (lELLULOSE FIBERS. Patent/dated Juno 22, 1926. Disclaimer filed November 8, 1934, by the assignee, Process Engineerx, 1m.

Hereby enters this disclaimer of claims 1 and 2 and of that part of the thing patented which is embraced by claims 1 :mil 2 in said specification, which am in the following words, to wit:

I A methgdof sizing paper, which consists in adding the size and alum to the paper stock after tho fibrsvof said stock have passed through the Jordan.

2. A method of sizing paper: uill ich consists in adding a sizo solution to the papgi tjstockrafter said stock has naiwl hv the Jordan.

[Ojficial G'azeffe Dw'ember 4, 1931] 

